quiz5 - Exam Name_ MULTIPLE CHOICE. Choose the one...

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The maximum frequency the human ear can detect is about 20kHz. If you walk into a room in which there are two sources, one at 100kHz and one at 102kHz. Will you hear anything? What if the second source is at 125kHz? A) Yes, yes. B) No, no. C) Yes, but only in certain places in the room for the first case, and no in the second case. D) Yes, no. E) No, yes. 1) 2) If the pressure amplitude of a sound wave doubles, what happens to the decibel level? A) -2dB B) 0dB C) 2dB D) 4dB E) 6dB 2) 3) You see an airplane straight overhead at an altitude of 5.2km. Sound from the plane, however, seems to be coming from a point back along the plane's path at a 35 degree angle to the vertical. What is the plane's speed, assuming a sound speed of 330 m/s? A) 100m/s B) 200m/s C) 300m/s D) 400m/s E) 500m/s 3) 4) At a soccer game, the "wave" might circulate through the stands and move around the

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